Automated Ultrasonic Testing (AUT)

 

Automated Ultrasonic Testing (AUT) is a term that covers a wide range of ultrasonic examination techniques which use powered mechanical scanners to locate flaws and corrosion with materials and equipment. Inspection types that fall under AUT include corrosion mapping inspections, pulse-echo weld inspection, high temperature scanning, Phased Array, and Time of Flight Diffraction.

AUT has gained recognition over the past several years due to a rapid advancement of computerized signal analysis and data presentation. This allows for a higher probability of detection and greater dynamics in the presentation of the resultant data. Digitally controlled raster or encoded linear scanning ensures complete coverage and accurate positioning while ensuring every signal is captured for analysis.

AUT works by using a scanner which is held on to the equipment with magnetic wheels, emitting ultrasonic waves that propagate through the vessel. These waves then travel through the material until they encounter a surface; this causes some of the energy to be reflected. Once acquired, the amount of reflected energy can then be measured and, from this, the thickness of the component and the size of any flaws can be detected. Compared to other inspection techniques, AUT has a high degree of repeatability and multiple scans can be taken over time to track the progress of corrosion. On the other hand, it has similar limitations as well. The preparations that are required to use this method are extensive and the process requires a great deal of interaction between the operating personnel and AUT inspectors, especially in high temperature examination environments, which can make it more difficult in some situations.

From in-service inspections of equipment to detect corrosion or thinning due to wear, to examinations of weldments to ensure code compliance, Hi-Tech Testing has the equipment, procedures, and qualified technicians to meet both your needs and all code, standard, and specification requirements.

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